Engine-valve.



G. 1?. IABORNL ENGINE VALVE. APPLIGATION FILE NOV.13, 1911.

Patented Mar. 18, 1913;

w x4 4/ a UNITED STATES ei-t rnwr oFFIoE.

GEORGE P. ABORN. CF BROOKLINE. MASSACHUSETTS. ASSIGNOR TO THE BLAKE & KNOWLES STEAM PUMP WORKS, A CQRPO BATI ON OF NEW JERSEY.

ENGINE- ietnam.

955 994 Specification of Letters Patent. l-ato tett Hal, 18, 1 913.,

i i Application filed November 13, 1911. Serial No. 659.968

TlqoZZ whom it may concern: the valve rod ll is at right angles to the Be it, known that I, GEORGE P. Anonx, a line of motion of the main slide valve 1? citizen of the United States, residing at l and the valve piston 12. The opening and Brookline, county of Xorfollu and State of f closing of the steam ports leading to the l tlassachusetts, have invented certain new i auxiliary cylinder are determined by the and useful Im rovement-s in Enginevalves, combined movements of the two valves, as fully describe and represented in the fol i will presently be described. lowing specification and the accompanying[ Referring now to Fig. 2, the seat of the drawings, forming a part of. the same. i 1 main slide valve is shown as being equipped engines or pumps, and more particularly to exhaust at 18, the two main inlets at 16 and to -'This invention relates generally to steam with seven ports. These ports are the main .3; 737,609 and 737,610. Its objects include the 20 valves.

such'en 'nes'as are equipped with fluid actu- 17, the two pro-admission inlets at 15 and tilted va ves of the general class shown and 27,-?md the two ports 20 and 22 communicatdescribed in Letters Patent to Hall Nos. ling with the auxiliary cylinder. The main stifle. valve 10 controls the movement of simplification of the valve mechanism, and steam through the main ports in the usual means toinsure continuous and regular, mannerfit also controls in the usual manner action of such moving parts of the engine or the pre-adjznission of steam through the ports pump as are controlled by the valve or 15 and 27 to prevent shoclt'upon the begin- 70,

- ning of a piston stroke in the main cylinder,

In the drawings, Figure 1 is a sectional and itpocltets the steam in the same ports side elevation of the valve arrangement, Fig. to prevent shock upon the completion of the is a plan of the valve seat upon the'steam piston stroke. In. addition to these funccylinder showing port connections, and Fig. tions, it cooperates with auxiliary valve 13 -25 3 is a sectional end elevation along the line by means of ports 19. 20. 2.1, and 23, 22 and of the valve rod. 28 to cushion the movement of auxiliarypis- Referring to Fig. Lthe main slide valve seat ton 12 by controlling the exhaust from the forming a part of the main steam cylinder auxiliary cylinder.

isindicatedat 26, channels 16 and 17 being The described mechanism operates as fol- 80 the inlet ports and 18 the exhaust port. The lows: Assuming the auxiliary piston 12, as

main slide valve 10 is of the D type and is viewed in Fig. 1, to be in its extreme left moved by the steam actuated piston 12 inhand position, the main slide valve 10 will closed in the auxiliary steam cylinder 11. be in a similar position with the main port The auxiliary steam cylinder is shown as 16 and the pie-admission port 15 open and of the main cylinder which it sin-mounts, inder piston, and with the ports-1? and 1S r 35 positioned at right angles to the axial line admitting steam to one side of the main cyl-' I l l a This auxiliary valve controls the admission l iary piston 12, while steam is exhausting 50 its seat upon the upper face of the main in communication with each other and at fol-ding a passagefor the exhaust steam from the other side of the main cylinder piston. Near the end of the stroke of'the latter piston. the auxiliary slide valve, as viewed in Fig. 3, will be moved to the left by the valve rod 14 and steam will pass through ports 19, 20 and 21 to the leftoflthe auxiland this is the preferred arangement ah I ough not essential to the broader features t the invention.

The central portion of valve piston 12 is semi-cylindrical in cross-section, as shown in Figs'l and 3, and in the space thus formed between the valve piston and the main slide valve 10, the, auxiliary valve 18 is located. and exhaust to and from thevalve piston and is moved by valve rod 14 which is actu- 1 ated in turn by the usual tappet arrangement,.not shown. The auxiliary valve has from the other end of the auxiliary cylinder through port 28 and thence th'roug hport 22 to'port 23-to the cavityunder'thciaux'iliary v slide valve 13 and out through exhaust; ports 24 and 18. The auxiliary piston and main slide valve.as' viewed in Fig. l, wilhnow slide valve 10, and its movement in line with valve will come to 3 ports at the indicated points a, a,

effect a throttling of die steam at such points and to prevent any rush of steam into the valve have reached the'end of their travel, and'the auxiliary piston will cushionon the steam confined between its end and the auxiliary cylinder head 29. The main slide rest with pre-ad nission port 27 and main port 17 open to steam, and main port 16 to exhaust; and the main cylinder piston will start on its return stroke. Further means are provided to control the admissionof steam into the main cylinder in order'to provide for aregular and smooth action of the engine. As shown in Fig. 1, the main slide valve 10 isprovided with overhanging or beetling sides 25, 25, which restrict the cross-sectional area of the so as to cylinder when the ports are 'fully opened,'- the amount of stean -flow through the ports being limited by the constricted passages (1,12 to any desired extent. At the same time, theexhaust passage formed in the center of the slide valve 10 is of such dimensions, as indicated at 7), that no back pressure is caused; the effect. of the valve conformation being such that only the inflowingsteam is tlirottled.

T his new and peculiar type of valve, with its overhanging parts is herein designated as a beetle valve, and by this term is meant a valve having projecting or overhanging parts which may in any way performithe function of throttling the steam between the valve'and the valve seat independently of the extent to which -the port, in the valve seat may be covered-or uncovered by any movement of the valve. This type of main valve may be used not only in fluid actuated valve mechanisms.- but generally in steam pumps and other engines. in which itis desired to thus throttle the motor fluid between the valve and valve seat, and the valve maybe actuated by any common, or suitable means. i

. The. construction shown and above de scribed is the preferred embodiment of the invention, but it will be understood that theinvention is not limited to the specific ar- 'angement of parts illustrated, but that the broader features of the invention, as defined by the claims, may be embodied in other constructions.

lVhat is claimed is:

1. A valve seat for an engine cylinder provided with inlet and exhaust ports, a valve movable to admit and exhaust motor tluid through said ports, the saidvalve having a beetling conformation adapted to nn nnlp he infiowing fluid at a point immeroman diately in advance of its passage into the port of the valve'seat.

2. A valve seat for an engine cylinder provided with inlet and exhaust ports, in combination with a admit and exhaust motor fluid through said ports, the said valve being adapted to throt-.- "'tle the fluid between the valve and the valve seat prior to its passage into the inlet ports of the valve seat.

3.'In a fluid actuated engine, the vlave seat 26, in combination with the slide valve 10 inclosed within a valve chest and equipped with throttling overhang 25, 25, substantially as shown and described.

l, InfOlilbilliltlOll, a fluid actuated valve gear including an auxiliary cylinder, an

auxiliary piston, a main slide valve atbeetle valve. movable to tached to and moved by said piston, an

auxiliary slide valve ino'unted upon the main slide valve'bctween the main slide valve and auxiliary piston, the said auxiliary slide valve being nested in said iston, but having its movement indepen ent thereof.

' 5. In combination, a fluid actuated valv gear including an auxiliary cylinder, an auxiliary piston, a main slide valve attached to and moved by said piston, an auxiliary slide valve seated upon and controlling ports in the main slide valve, the said auxiliary valve being located between the main slide valve and 'the auxiliary piston, substantially as shown and described.

(3. In combination. the valve seat of a main cylinder, the'inaiii slide valve working upon said seat, an auxiliary cylinder, a pistonlocatedwithin the auxiliary cylinder, the said valve and piston being coupled together to move as a unit, the valve being moved by the piston, an auxiliary valve seated upon the main slide valve and movable thereupon iii a direction at rightangles to the line of movement of the main slide valve, ports in the main slide valve cooperating withthe auxiliary valve, ports in the valve seat of the main cylinder connected, with the auxiliary operating with the said ports. in the main slide valve and with the auxiliary valve, the arrangement being such that the said piston is primarily controlled by the movement of the auxiliary valve upon the main slide valve, and is secondarily controlled by the movement of the main slide valve under the auxiliary slide valve. I

7. In combination,- the valve seat of a main cylinder, the main slide valve working upon said seat, an auxiliary cylinder, a piston located within the auxiliary cylinder and adapted to move the said slide valve, an auxiliary valve seated upon themiain slide valve and movable thereupon, passages in cylinder and cothe auxiliary valve. in the main slide. valve,

and in the-valve seat of the main cylinder whereby the said piston is primarily controlled by the movement of the'auxiliary valve upon the main slide valve and is secondarily controlled by the movement of the main slide valve under the auxiliary slide valve.

In testimony whereof; I have hereunto set my scribing witnesses. I

GEORGE P. AB'ORN.

\Vitnesses JOHN F INLEY,. E.. H. Hmos.

hand, in the presence of two sub- 10 

